National Semiconductor LM124A, LM124QML Technical data

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LM124A/LM124QML
Low Power Quad Operational Amplifiers

LM124A/LM124QML Low Power Quad Operational Amplifiers

January 2005

General Description

The LM124/124A consists of four independent, high gain,
internally frequency compensated operational amplifiers
which were designed specifically to operate from a single
power supply over a wide range of voltages. Operation from
split power supplies is also possible and the low power
supply current drain is independent of the magnitude of the
power supply voltage.

Application areas include transducer amplifiers, DC gain
blocks and all the conventional op amp circuits which now
can be more easily implemented in single power supply
systems. For example, the LM124/124A can be directly op­erated off of the standard +5Vdc power supply voltage which
is used in digital systems and will easily provide the required
interface electronics without requiring the additional +15Vdc
power supplies.

Unique Characteristics

n In the linear mode the input common-mode voltage

range includes ground and the output voltage can also
swing to ground, even though operated from only a
single power supply voltage

n The unity gain cross frequency is temperature

compensated

n The input bias current is also temperature compensated

Advantages

n Eliminates need for dual supplies
n Four internally compensated op amps in a single

package

n Allows directly sensing near GND and V

to GND

n Compatible with all forms of logic
n Power drain suitable for battery operation

OUT

also goes

Features

n Internally frequency compensated for unity gain
n Large DC voltage gain 100 dB
n Wide bandwidth (unity gain) 1 MHz

(temperature compensated)

n Wide power supply range:

Single supply 3V to 32V
or dual supplies

n Very low supply current drain (700 µA) — essentially

independent of supply voltage

n Low input biasing current 45 nA

(temperature compensated)

n Low input offset voltage 2 mV

and offset current: 5 nA

n Input common-mode voltage range includes ground
n Differential input voltage range equal to the power

supply voltage

n Large output voltage swing 0V to V

±

1.5V to±16V

+

− 1.5V

Ordering Information

NS PART NUMBER SMD PART NUMBER NS PACKAGE NUMBER PACKAGE DISCRIPTION

LM124J/883 7704301CA J14A 14LD CERDIP

LM124AE/883 77043022A E20A 20LD LEADLESS CHIP CARRIER

LM124AJ/883 7704302CA J14A 14LD CERDIP

LM124AW/883 W14B 14LD CERPACK

LM124AWG/883 7704302XA WG14A 14LD CERAMIC SOIC

LM124AJLQMLV 5962L9950401VCA,

50k rd(Si)

LM124AJRQMLV 5962R9950401VCA,

100k rd(Si)

LM124AWGLQMLV 5962L9950401VZA,

50k rd(Si)

LM124AWGRQMLV 5962R9950401VZA,

100k rd(Si)

LM124AWLQMLV 5962L9950401VDA,

50k rd(Si)

LM124AWRQMLV 5962R9950401VDA,

100k rd(Si)

© 2005 National Semiconductor Corporation DS201080 www.national.com

J14A 14LD CERDIP

J14A 14LD CERDIP

WG14A 14LD CERAMIC SOIC

WG14A 14LD CERAMIC SOIC

W14B 14LD CERPACK

W14B 14LD CERPACK

Connection Diagrams

LM124A/LM124QML

Leadless Chip Carrier

See NS Package Number E20A

Dual-In-Line Package

Top View

See NS Package Number J14A

20108055

20108001

See NS Package Number W14B or WG14A

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20108033

Schematic Diagram (Each Amplifier)

LM124A/LM124QML

20108002

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Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

Supply Voltage, V

+

Differential Input Voltage 32Vdc

Input Voltage −0.3Vdc to +32Vdc

LM124A/LM124QML

Input Current

<

(V

−0.3Vdc) (Note 4) 50 mA

IN

Power Dissipation (Note 2)

CERDIP 1260mW

CERPACK 700mW

LCC 1350mW

CERAMIC SOIC 700mW

Output Short-Circuit to GND

(One Amplifier) (Note 3)

+

V

≤ 15Vdc and TA= 25˚C Continuous

Operating Temperature Range −55˚C ≤ T

Maximum Junction Temperature 150˚C

Storage Temperature Range −65˚C ≤ T

Lead Temperature (Soldering, 10 seconds) 260˚C

Thermal Resistance ThetaJA

CERDIP (Still Air) 103 C/W

(500LF/Min Air flow) 51 C/W

CERPACK (Still Air) 176 C/W

(500LF/Min Air flow) 116 C/W

LCC (Still Air) 91 C/W

(500LF/Min Air flow) 66 C/W

CERAMIC SOIC (Still Air) 176 C/W

(500LF/Min Air flow) 116 C/W

ThetaJC

CERDIP 19 C/W

CERPACK 18 C/W

LCC 24 C/W

CERAMIC SOIC 18 C/W

Package Weight (Typical)

CERDIP TBD

CERPACK TBD

LCC TBD

CERAMIC SOIC 410mg

ESD Tolerance (Note 5) 250V

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.

Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by Tjmax (maximum junction temperature), ThetaJA (package
junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is Pdmax = (Tjmax ­TA)/ThetaJA or the number given in the Absolute Maximum Ratings, whichever is lower.

Note 3: Short circuits from the output to V+ can cause excessive heating and eventual destruction. When considering short circuits to ground, the maximum output
current is approximately 40mAindependent of the magnitude of V+. At values of supply voltage in excess of +15Vdc, continuous short-circuits can exceed the power
dissipation ratings and cause eventual destruction. Destructive dissipation can result from simultaneous shorts on all amplifiers.

Note 4: This input current will only exist when the voltage at any of the input leads is driven negative. It is due to the collector-base junction of the input PNP
transistors becoming forward biased and thereby acting as input diode clamps. In addition to this diode action, there is also lateral NPN parasitic transistor action
on the IC chip. This transistor action can cause the output voltages of the op amps to go to the V+ voltage level (or to ground for a large overdrive) for the time
duration that an input is driven negative. This is not destructive and normal output states will re-establish when the input voltage, which was negative, again returns
to a value greater than -0.3Vdc (at 25 C).

Note 5: Human body model, 1.5 kΩ in series with 100 pF.

32Vdc or +16Vdc

≤ +125˚C

A

≤ +150˚C

A

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Quality Conformance Inspection

MIL-STD-883, Method 5005 — Group A

Subgroup Description Temp ( ˚C)

1 Static tests at +25

2 Static tests at +125

3 Static tests at -55

4 Dynamic tests at +25

5 Dynamic tests at +125

6 Dynamic tests at -55

7 Functional tests at +25

8A Functional tests at +125

8B Functional tests at -55

9 Switching tests at +25

10 Switching tests at +125

11 Switching tests at -55

LM124A/LM124QML

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LM124A 883 DC Electrical Characteristics

(The following conditions apply to all the following parameters, unless otherwise specified.) All voltages referenced to device
ground.

SYMBOL PARAMETER CONDITIONS NOTES MIN MAX UNIT SUB-

Icc Power Supply Current V+ = 5V 1.2 mA 1, 2, 3

LM124A/LM124QML

Isink Output Sink Current V+ = 15V, Vout = 200mV,

Isource Output Source

Current

Ios Short Circuit Current V+ = 5V, Vout = 0V -60 mA 1

Vio Input Offset Voltage V+ = 30V, Vcm = 0V -2 2 mV 1

CMRR Common Mode

Rejection Ratio

±

Iib Input Bias Current V+ = 5V, Vcm = 0V -50 10 nA 1

Iio Input Offset Current V+ = 5V, Vcm = 0V -10 10 nA 1

PSRR Power Supply

Rejection Ratio

Vcm Common Mode

Voltage Range

Avs Large Signal Gain V+ = 15V, Rl = 2K Ohms,

Voh Output Voltage High V+ = 30V, Rl = 2K Ohms 26 V 4, 5, 6

Vol Output Voltage Low V+ = 30V, Rl = 10K Ohms 40 mV 4, 5, 6

Channel Separation
Amp to Amp Coupling

V+ = 30V 3.0 mA 1

4.0 mA 2, 3

12 uA 1

+Vin = 0mV, -Vin = +65mV

V+ = 15V, Vout = 2V,
+Vin = 0mV, -Vin = +65mV

V+ = 15V, Vout = 2V,
+Vin = 0mV, -Vin = -65mV

V+ = 30V, Vcm = 28.5V -2 2 mV 1

V+ = 30V, Vcm = 28V -4 4 mV 2, 3

V+ = 5V, Vcm = 0V -2 2 mV 1

V+ = 30V, Vin = 0V to 28.5V 70 dB 1

V+ = 5V to 30V, Vcm = 0V 65 dB 1

V+ = 30V (Note 6) 28.5 V 1

(Note 6) 28 V 2, 3

(Note 7) 50 V/mV 4

Vo=1Vto11V

V+ = 30V, Rl = 10K Ohms 27 V 4, 5, 6

V+ = 30V, Isink = 1uA 40 mV 4

V+ = 5V, Rl = 10K Ohms 20 mV 4, 5, 6

1KHz, 20KHz (Note 8) 80 dB 4

(Note 7) 25 V/mV 5, 6

10 mA 1

5mA2,3

-20 mA 1

-10 mA 2, 3

-4 4 mV 2, 3

-4 4 mV 2, 3

-100 10 nA 2, 3

-30 30 nA 2, 3

100 mV 5, 6

GROUPS

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LM124 883 DC Electrical Characteristics

(The following conditions apply to all the following parameters, unless otherwise specified.) All voltages referenced to device
ground.

SYMBOL PARAMETER CONDITIONS NOTES MIN MAX UNIT SUB-

GROUPS

Icc Power Supply Current V+ = 5V 1.2 mA 1, 2, 3

V+ = 30V 3.0 mA 1

4.0 mA 2, 3

Isink Output Sink Current V+ = 15V, Vout = 200mV,

+Vin = 0mV, -Vin = +65mV

V+ = 15V, Vout = 2V,
+Vin = 0mV, -Vin = +65mV

Isource Output Source

Current

Ios Short Circuit Current V+ = 5V, Vout = 0V -60 mA 1

Vio Input Offset Voltage V+ = 30V, Vcm = 0V -5 5 mV 1

CMRR Common Mode

Rejection Ratio

+Iib Input Bias Current V+ = 5V, Vcm = 0V -150 10 nA 1

Iio Input Offset Current V+ = 5V, Vcm = 0V -30 30 nA 1

PSRR Power Supply

Rejection Ratio

Vcm Common Mode

Voltage Range

Avs Large Signal Gain V+ = 15V, Rl = 2K Ohms,

Voh Output Voltage High V+ = 30V, Rl = 2K Ohms 26 V 4, 5, 6

Vol Output Voltage Low V+ = 30V, Rl = 10K Ohms 40 mV 4, 5, 6

Channel Separation
(Amp to Amp
Coupling)

V+ = 15V, Vout = 2V,
+Vin = 0mV, -Vin = -65mV

V+ = 30V, Vcm = 28V -5 5 mV 1

V+ = 5V, Vcm = 0V -5 5 mV 1

V+ = 30V, Vcm = 28.5V -5 5 mV 1

V+ = 30V, Vin = 0V to 28.5V 70 dB 1

V+ = 5V to 30V, Vcm = 0V 65 dB 1

V+ = 30V (Note 6) 28.5 V 1

(Note 6) 28 V 2, 3

Vo=1Vto11V

V+ = 30V, Rl = 10K Ohms 27 V 4, 5, 6

V+ = 30V, Isink = 1uA 40 mV 4

V+ = 5V, Rl = 10K Ohms 20 mV 4, 5, 6

1KHz, 20KHz (Note 8) 80 dB 4

12 uA 1

10 mA 1

5mA2,3

-20 mA 1

-10 mA 2, 3

-7 7 mV 2, 3

-7 7 mV 2, 3

-7 7 mV 2, 3

-300 10 nA 2, 3

-100 100 nA 2, 3

50 V/mV 4

25 V/mV 5, 6

100 mV 5, 6

LM124A/LM124QML

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LM124A RAD HARD DC Electrical Characteristics (Note 10)

(The following conditions apply to all the following parameters, unless otherwise specified.) All voltages referenced to device
ground.

SYMBOL PARAMETER CONDITIONS NOTES MIN MAX UNIT SUB-

Vio Input Offset Voltage Vcc+ = 30V, Vcc- = Gnd,

LM124A/LM124QML

Iio Input Offset Current Vcc+ = 30V, Vcc- = Gnd,

±

Iib Input Bias Current Vcc+ = 30V, Vcc- = Gnd,

+PSRR Power Supply

Rejection Ratio

CMRR Common Mode

Rejection Ratio

Ios+ Output Short Circiut

Current

Icc Power Supply Current Vcc+ = 30V, Vcc- = Gnd 3 mA 1, 2

Delta Vio/
Delta T

Delta Iio/
Delta T

Input Offset Voltage
Temperature
Sensitivity

Input Offset Current
Temperature
Sensitivity

Vcm = -15V

Vcc+ = 2V, Vcc- = -28V,
Vcm = 13V

Vcc+ = 5V, Vcc- = Gnd,
Vcm = -1.4V

Vcc+ = 2.5V, Vcc- = -2.5,
Vcm = 1.1V

Vcm = -15V

Vcc+ = 2V, Vcc- = -28V,
Vcm = 13V

Vcc+ = 5V, Vcc- = Gnd,
Vcm = -1.4V

Vcc+ = 2.5V, Vcc- = -2.5,
Vcm = 1.1V

Vcm = -15V

Vcc+ = 2V, Vcc- = -28V,
Vcm = 13V

Vcc+ = 5V, Vcc- = Gnd,
Vcm = -1.4V

Vcc+ = 2.5V, Vcc- = -2.5,
Vcm = 1.1V

Vcc- = Gnd, Vcm = -1.4V,
5V ≤ Vcc ≤ 30V

Vcc+ = 30V, Vcc- = Gnd,
Vo = 25V

+25˚C ≤ TA ≤ +125˚C,
+Vcc = 5V, -Vcc = 0V,
Vcm = -1.4V

-55˚C ≤ TA ≤ +25˚C, +Vcc = 5V,

-Vcc = 0V, Vcm = -1.4V

+25˚C ≤ TA ≤ +125˚C,
+Vcc = 5V, -Vcc = 0V,
Vcm = -1.4V

-55˚C ≤ TA ≤ +25˚C, +Vcc = 5V,

-Vcc = 0V, Vcm = -1.4V

(Note 9) -30 30 uV/ ˚C 2

(Note 9) -30 30 uV/ ˚C 3

(Note 9) -400 400 pA/˚ C 2

(Note 9) -700 700 pA/ ˚C 3

-2 2 mV 1

-4 4 mV 2, 3

-2 2 mV 1

-4 4 mV 2, 3

-2 2 mV 1

-4 4 mV 2, 3

-2 2 mV 1

-4 4 mV 2, 3

-10 10 nA 1, 2

-30 30 nA 3

-10 10 nA 1, 2

-30 30 nA 3

-10 10 nA 1, 2

-30 30 nA 3

-10 10 nA 1, 2

-30 30 nA 3

-50 +0.1 nA 1, 2

-100 +0.1 nA 3

-50 +0.1 nA 1, 2

-100 +0.1 nA 3

-50 +0.1 nA 1, 2

-100 +0.1 nA 3

-50 +0.1 nA 1, 2

-100 +0.1 nA 3

-100 100 uV/V 1, 2, 3

76 dB 1, 2, 3

-70 mA 1, 2,3

4mA3

GROUPS

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LM124A RAD HARD AC/DC Electrical Characteristics (Note 10)

(The following conditions apply to all the following parameters, unless otherwise specified.) All voltages referenced to device
ground.

SYMBOL PARAMETER CONDITIONS NOTES MIN MAX UNIT SUB-

GROUPS

Vol Logical "0" Output

Voltage

Voh Logical "1" Output

Voltage

Avs+ Voltage Gain

Avs Voltage Gain Vcc+ = 5V, Vcc- = Gnd,

+Vop Maximum Output

Voltage Swing

TR(tr) Transient Response:

Rise Time

TR(os) Transient Response:

Overshoot

±

Sr Slew Rate: Rise Vcc+ = 30V, Vcc- = Gnd 0.1 V/uS 7, 8A, 8B

Slew Rate: Fall Vcc+ = 30V, Vcc- = Gnd 0.1 V/uS 7, 8A, 8B

Vcc+ = 30V, Vcc- = Gnd,
Rl = 10K Ohms

Vcc+ = 30V, Vcc- = Gnd,
Iol = 5mA

Vcc+ = 4.5V, Vcc- = Gnd,
Iol = 2uA

Vcc+ = 30V, Vcc- = Gnd,
Ioh = -10mA

Vcc+ = 4.5V, Vcc- = Gnd,
Ioh = -10mA

Vcc+ = 30V, Vcc- = Gnd,
1V ≤ Vo ≤ 26V, Rl = 10K Ohms

Vcc+ = 30V, Vcc- = Gnd,
5V ≤ Vo ≤ 20V, Rl = 2K Ohms

1V ≤ Vo ≤ 2.5V, Rl = 10K Ohms

Vcc+ = 5V, Vcc- = Gnd,
1V ≤ Vo ≤ 2.5V, Rl = 2K Ohms

Vcc+ = 30V, Vcc- = Gnd,
Vo = +30V, Rl = 10K Ohms

Vcc+ = 30V, Vcc- = Gnd,
Vo = +30V, Rl = 2K Ohms

Vcc+ = 30V, Vcc- = Gnd 1 uS 7, 8A, 8B

Vcc+ = 30V, Vcc- = Gnd 50 % 7, 8A, 8B

27 V 4,5,6

2.4 V 4,5,6

50 V/mV 4

25 V/mV 5, 6

50 V/mV 4

25 V/mV 5, 6

10 V/mV 4, 5, 6

10 V/mV 4, 5, 6

27 V 4,5,6

26 V 4,5,6

35 mV 4, 5, 6

1.5 V 4,5,6

0.4 V 4,5,6

LM124A/LM124QML

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LM124A RAD HARD — AC Electrical Characteristics (Note 10)

(The following conditions apply to all the following parameters, unless otherwise specified.) AC: +Vcc = 30V, -Vcc = 0V

SYMBOL PARAMETER CONDITIONS NOTES MIN MAX UNIT SUB-

NI(BB) Noise Broadband +Vcc = 15V, -Vcc = -15V,

LM124A/LM124QML

NI(PC) Noise Popcorn +Vcc = 15V, -Vcc = -15V,

Cs Channel Separation +Vcc = 30V, -Vcc = Gnd,

BW = 10Hz to 5KHz

Rs = 20K Ohms,
BW = 10Hz to 5KHz

Rl = 2K Ohms

Rl = 2K Ohms,
Vin=1Vand16V,AtoB

Rl = 2K Ohms,
Vin=1Vand16V,AtoC

Rl = 2K Ohms,
Vin=1Vand16V,AtoD

Rl = 2K Ohms,
Vin=1Vand16V,BtoA

Rl = 2K Ohms,
Vin=1Vand16V,BtoC

Rl = 2K Ohms,
Vin=1Vand16V,BtoD

Rl = 2K Ohms,
Vin=1Vand16V,CtoA

Rl = 2K Ohms,
Vin=1Vand16V,CtoB

Rl = 2K Ohms,
Vin=1Vand16V,CtoD

Rl = 2K Ohms,
Vin=1Vand16V,DtoA

Rl = 2K Ohms,
Vin=1Vand16V,DtoB

Rl = 2K Ohms,
Vin=1Vand16V,DtoC

80 dB 7

80 dB 7

80 dB 7

80 dB 7

80 dB 7

80 dB 7

80 dB 7

80 dB 7

80 dB 7

80 dB 7

80 dB 7

80 dB 7

80 dB 7

15 uVrm s 7

50 uVpK 7

GROUPS

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LM124A RAD HARD — DC Drift Values (Note 10)

(The following conditions apply to all the following parameters, unless otherwise specified.) DC: "Delta calculationsperformed
on QMLV devices at group B, subgroup 5 only"

SYMBOL PARAMETER CONDITIONS NOTES MIN MAX UNIT SUB-

GROUPS

Vio Input Offset Voltage Vcc+ = 30V, Vcc- = Gnd,

-0.5 0.5 mV 1

Vcm = -15V

±

Iib Input Bias Current Vcc+ = 30V, Vcc- = Gnd,

-10 10 nA 1

Vcm = -15V

Electrical Characteristics — POST RADIATION LIMITS +25˚C (Note 10)

(The following conditions apply to all the following parameters, unless otherwise specified.) All voltages referenced to device
ground.

SYMBOL PARAMETER CONDITIONS NOTES MIN MAX UNIT SUB-

GROUPS

Vio Input Offset Voltage Vcc+ = 30V, Vcc- = Gnd,

Vcm = -15V

Vcc+ = 2V, Vcc- = -28V,
Vcm = 13V

Vcc+ = 5V, Vcc- = GND,
Vcm = -1.4V

Vcc+ = 2.5V, Vcc- = -2.5,
Vcm = 1.1V

Iio Input Offset Current Vcc+ = 30V, Vcc- = GND,

Vcm = -15V

Vcc+ = 2V, Vcc- = -28V,
Vcm = 13V

Vcc+ = 5V, Vcc- = GND,
Vcm = -1.4V

Vcc+ = 2.5V, Vcc- = -2.5V,
Vcm = 1.1V

±

Iib Input Bias Current Vcc+ = 30V, Vcc- = GND,

Vcm = -15V

Vcc+ = 2V, Vcc- = -28V,
Vcm = 13V

Vcc+ = 5V, Vcc- = GND,
Vcm = -1.4V

Vcc+ = 2.5V, Vcc- = -2.5V,
Vcm = 1.1V

Avs+ Voltage Gain Vcc+ = 30V, Vcc- = GND,

1V ≤ Vo ≤ 26V, Rl = 10K Ohms

Vcc+ = 30V, Vcc- = GND,
5V ≤ Vo ≤ 20V, Rl = 2K Ohms

Note 6: Guaranteed by Vio tests.

Note 7: Datalog reading in K=V/mV

Note 8: Guaranteed, not tested

Note 9: Calculated parameters

Note 10: Pre and post irradiation limits are identical to those listed under AC and DC electrical characteristics except as listed in the Post Radiation Limits Table.

These parts may be dose rate sensitive in a space environment and demonstrate enhanced low dose rate effect. Radiation end point limits for the noted parameters
are guaranteed only for the conditions as specified in MIL-STD-883, Method 1019

(Note 10) -2.5 2.5 mV 1

(Note 10) -2.5 2.5 mV 1

(Note 10) -2.5 2.5 mV 1

(Note 10) -2.5 2.5 mV 1

(Note 10) -15 15 nA 1

(Note 10) -15 15 nA 1

(Note 10) -15 15 nA 1

(Note 10) -15 15 nA 1

(Note 10) -75 +0.1 nA 1

(Note 10) -75 +0.1 nA 1

(Note 10) -75 +0.1 nA 1

(Note 10) -75 +0.1 nA 1

(Note 10) 40 V/mV 4

(Note 10) 40 V/mV 4

LM124A/LM124QML

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Typical Performance Characteristics

Input Voltage Range Input Current

LM124A/LM124QML

20108034 20108035

Supply Current Voltage Gain

Open Loop Frequency

Response

20108036 20108037

Common Mode Rejection

Ratio

20108038

20108039

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Typical Performance Characteristics (Continued)

LM124A/LM124QML

Voltage Follower Pulse

Response

Large Signal Frequency

Response

20108040

Voltage Follower Pulse

Response (Small Signal)

20108041

Output Characteristics

Current Sourcing

20108042

Output Characteristics

Current Sinking Current Limiting

20108044

20108043

20108045

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Application Hints

The LM124 series are op amps which operate with only a
single power supply voltage, have true-differential inputs,
and remain in the linear mode with an input common-mode
voltage of 0 V
of power supply voltage with little change in performance
characteristics. At 25˚C amplifier operation is possible down
to a minimum supply voltage of 2.3 V

LM124A/LM124QML

The pinouts of the package have been designed to simplify
PC board layouts. Inverting inputs are adjacent to outputs for
all of the amplifiers and the outputs have also been placed at
the corners of the package (pins 1, 7, 8, and 14).

Precautions should be taken to insure that the power supply
for the integrated circuit never becomes reversed in polarity
or that the unit is not inadvertently installed backwards in a
test socket as an unlimited current surge through the result­ing forward diode within the IC could cause fusing of the
internal conductors and result in a destroyed unit.

Large differential input voltages can be easily accommo­dated and, as input differential voltage protection diodes are
not needed, no large input currents result from large differ­ential input voltages. The differential input voltage may be
larger than V
should be provided to prevent the input voltages from going
negative more than −0.3 V
with a resistor to the IC input terminal can be used.

To reduce the power supply drain, the amplifiers have a
class A output stage for small signal levels which converts to
class B in a large signal mode. This allows the amplifiers to
both source and sink large output currents. Therefore both
NPN and PNP external current boost transistors can be used
to extend the power capability of the basic amplifiers. The
output voltage needs to raise approximately 1 diode drop
above ground to bias the on-chip vertical PNP transistor for
output current sinking applications.

For ac applications, where the load is capacitively coupled to
the output of the amplifier, a resistor should be used, from
the output of the amplifier to ground to increase the class A
bias current and prevent crossover distortion.

. These amplifiers operate over a wide range

DC

.

DC

+

without damaging the device. Protection

(at 25˚C). An input clamp diode

DC

Where the load is directly coupled, as in dc applications,
there is no crossover distortion.

Capacitive loads which are applied directly to the output of
the amplifier reduce the loop stability margin. Values of
50 pF can be accommodated using the worst-case non­inverting unity gain connection. Large closed loop gains or
resistive isolation should be used if larger load capacitance
must be driven by the amplifier.

The bias network of the LM124 establishes a drain current
which is independent of the magnitude of the power supply
voltage over the range of from 3 V

to 30 VDC.

DC

Output short circuits either to ground or to the positive power
supply should be of short time duration. Units can be de­stroyed, not as a result of the short circuit current causing
metal fusing, but rather due to the large increase in IC chip
dissipation which will cause eventual failure due to exces­sive junction temperatures. Putting direct short-circuits on
more than one amplifier at a time will increase the total IC
power dissipation to destructive levels, if not properly pro­tected with external dissipation limiting resistors in series
with the output leads of the amplifiers. The larger value of
output source current which is available at 25˚C provides a
larger output current capability at elevated temperatures
(see typical performance characteristics) than a standard IC
op amp.

The circuits presented in the section on typical applications
emphasize operation on only a single power supply voltage.
If complementary power supplies are available, all of the
standard op amp circuits can be used. In general, introduc­ing a pseudo-ground (a bias voltage reference of V

+

/2) will
allow operation above and below this value in single power
supply systems. Many application circuits are shown which
take advantage of the wide input common-mode voltage
range which includes ground. In most cases, input biasing is
not required and input voltages which range to ground can
easily be accommodated.

www.national.com 14

Typical Single-Supply Applications

(V+= 5.0 VDC)

Non-Inverting DC Gain (0V Input = 0V Output)

LM124A/LM124QML

*R not needed due to temperature independent I

DC Summing Amplifier

≥ 0VDCand VO≥ VDC) Power Amplifier

(V

IN’S

Where: V0=V1+V2−V3−V

(V1+V2) ≥ (V3+V4) to keep V

4

>

0V

O

IN

20108006

DC

V0=0VDCfor VIN=0V

AV=10

DC

20108005

20108007

www.national.com15

Typical Single-Supply Applications (V

LED Driver “BI-QUAD” RC Active Bandpass Filter

LM124A/LM124QML

20108008

+

= 5.0 VDC) (Continued)

fo= 1 kHz

Q=50

= 100 (40 dB)

A

V

Fixed Current Sources Lamp Driver

20108010

20108009

20108011

www.national.com 16

LM124A/LM124QML

Typical Single-Supply Applications

(V+= 5.0 VDC) (Continued)

Current Monitor

20108012

Pulse Generator

20108015

Squarewave Oscillator

*(Increase R1 for ILsmall)

Driving TTL

20108016

Pulse Generator

20108013

Voltage Follower

20108014

20108017

www.national.com17

Typical Single-Supply Applications (V

High Compliance Current Sink

LM124A/LM124QML

+

= 5.0 VDC) (Continued)

IO= 1 amp/volt V

(Increase REfor Iosmall)

IN

20108018

Low Drift Peak Detector

www.national.com 18

20108019

Typical Single-Supply Applications (V

Comparator with Hysteresis Ground Referencing a Differential Input Signal

20108020

+

= 5.0 VDC) (Continued)

LM124A/LM124QML

Voltage Controlled Oscillator Circuit

*Wide control voltage range: 0 VDC≤ VC≤ 2(V+−1.5 VDC)

VO=V

R

Photo Voltaic-Cell Amplifier

20108021

20108022

20108023

www.national.com19

Typical Single-Supply Applications (V

AC Coupled Inverting Amplifier

LM124A/LM124QML

AC Coupled Non-Inverting Amplifier

+

= 5.0 VDC) (Continued)

20108024

www.national.com 20

20108025

Typical Single-Supply Applications (V

DC Coupled Low-Pass RC Active Filter

+

= 5.0 VDC) (Continued)

LM124A/LM124QML

fO= 1 kHz

Q=1

=2

A

V

20108026

High Input Z, DC Differential Amplifier

20108027

www.national.com21

Typical Single-Supply Applications (V

DC Instrumentation Amplifier

LM124A/LM124QML

+

= 5.0 VDC) (Continued)

High Input Z Adjustable-Gain

20108028

Using Symmetrical Amplifiers to

Reduce Input Current (General Concept)

Bridge Current Amplifier

20108030

20108029

www.national.com 22

Typical Single-Supply Applications (V

Bandpass Active Filter

+

= 5.0 VDC) (Continued)

LM124A/LM124QML

fO= 1 kHz

Q=25

20108031

www.national.com23

Revision History Section

Date
Released Revision Section Originator Changes

9–2–04 A New Release, Corporate format R. Malone 3 MDS data sheets converted into one

Corp. data sheet format. MNLM124-X,

LM124A/LM124QML

01/27/05 B Connection Diagrams, Quality

Conformance Inspection Section,
and Physical Dimensions drawings

R. Malone Added E package Connection Diagram.

Rev. 1A2, MNLM124A-X, Rev. 1A3 and
MRLM124A-X-RH, Rev. 5A0. MDS data
sheets will be archived.

Changed verbiage under Quality
Conformance Title, and Updated
Revisions for the Marketing Drawings.

www.national.com 24

Physical Dimensions inches (millimeters) unless otherwise noted

SAMPLE TEXT Ceramic Dual-In-Line Package (J)

NS Package Number J14A

LM124A/LM124QML

SAMPLE TEXT 20 Pin Leadless Chip Carrier, Type C (E)

NS Package Number E20A

www.national.com25

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

LM124A/LM124QML

SAMPLE TEXT Ceramic Flatpak Package

NS Package Number W14B

SAMPLE TEXT 14-Pin Ceramic Package (WG)

NS Package Number WG14A

www.national.com 26

Notes

LM124A/LM124QML Low Power Quad Operational Amplifiers

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.

For the most current product information visit us at www.national.com.

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR
CORPORATION. As used herein:

1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and whose failure to perform when
properly used in accordance with instructions for use

2. A critical component is any component of a life support
device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.

provided in the labeling, can be reasonably expected to result
in a significant injury to the user.

BANNED SUBSTANCE COMPLIANCE

National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship
Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned
Substances’’ as defined in CSP-9-111S2.

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Support Center

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